Paleoecological Dynamics in Amazonian Ecosystems
Summary
Amazonian ecosystems represent one of the planet’s largest carbon reservoirs and harbour unparalleled biodiversity. Paleoecological studies reconstruct past landscapes by analysing sedimentary archives from lakes, rivers, wetlands and lateritic deposits. These archives preserve evidence of vegetation shifts, fire regimes, hydrological changes and biogeochemical cycles over timescales extending from millennia into the Quaternary. Integrating pollen analysis, isotopic signatures and elemental geochemistry, researchers have elucidated how climatic fluctuations during the late-glacial and Holocene epochs influenced forest–savanna boundaries, modulated soil erosion and dictated organic matter burial. Alternating wet and dry phases have driven dynamic shifts in forest biomass, savanna expansion and wetland productivity, while riverine systems have alternated between acting as carbon sinks and sources in response to hydrological variability. These palaeoecological dynamics bear directly on contemporary conservation, providing a long-term baseline for understanding current trends in deforestation, greenhouse-gas emissions and hydrological disruption. By revealing the resilience and tipping points of Amazonian biomes, such research informs projections of ecosystem responses to ongoing climatic change and guides sustainable management of water, carbon and biodiversity across the basin.
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Paleoecological Dynamics in Amazonian Ecosystems publication trend
The graph below shows the total number of articles in paleoecological dynamics in amazonian ecosystems across all publications each year (not limited to Nature Index journals).
Technical terms
Palynology: The study of pollen and spores preserved in sediments to infer past vegetation and environmental changes.
Multiproxy analysis: Integration of diverse geochemical, biological and sedimentological indicators to reconstruct palaeoenvironmental conditions.
Allochthonous: Organic or inorganic material originating outside the depositional environment and transported into it.
Autochthonous: Organic matter produced within the depositional basin itself.
Radiocarbon dating: Chronological method based on the decay of carbon-14 to determine the age of organic remains.
References
- The Fate of Carbon in Sediments of the Xingu and Tapajós Clearwater Rivers, Eastern Amazon. Frontiers in Marine Science (2017).
- Basin morphology, sedimentology and seismic stratigraphy of an upland lake from Serra dos Carajás, southeastern Amazon, Brazil. Boletim do Museu Paraense Emílio Goeldi - Ciências Naturais (2017).
- Holocene history of a lake filling and vegetation dynamics of the Serra Sul dos Carajás, southeast Amazonia. Anais da Academia Brasileira de Ciências (2019).
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